/*
 * jpeglib.h
 *
 * Copyright (C) 1991-1995, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file defines the application interface for the JPEG library.
 * Most applications using the library need only include this file,
 * and perhaps jerror.h if they want to know the exact error codes.
 */

#ifndef JPEGLIB_H
#define JPEGLIB_H

typedef unsigned char boolean;

/*
 * First we include the configuration files that record how this
 * installation of the JPEG library is set up.  jconfig.h can be
 * generated automatically for many systems.  jmorecfg.h contains
 * manual configuration options that most people need not worry about.
 */

#ifndef JCONFIG_INCLUDED		/* in case jinclude.h already did */
#include "../jpeg-6/jconfig.h"	/* widely used configuration options */
#endif
#include "../jpeg-6/jmorecfg.h"	/* seldom changed options */


/* Version ID for the JPEG library.
 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
 */

#define JPEG_LIB_VERSION  60	/* Version 6 */


/* Various constants determining the sizes of things.
 * All of these are specified by the JPEG standard, so don't change them
 * if you want to be compatible.
 */

#define DCTSIZE		    8		/* The basic DCT block is 8x8 samples */
#define DCTSIZE2	    64		/* DCTSIZE squared; # of elements in a block */
#define NUM_QUANT_TBLS      4	/* Quantization tables are numbered 0..3 */
#define NUM_HUFF_TBLS       4	/* Huffman tables are numbered 0..3 */
#define NUM_ARITH_TBLS      16	/* Arith-coding tables are numbered 0..15 */
#define MAX_COMPS_IN_SCAN   4	/* JPEG limit on # of components in one scan */
#define MAX_SAMP_FACTOR     4	/* JPEG limit on sampling factors */
/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
 * to handle it.  We even let you do this from the jconfig.h file.  However,
 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
 * sometimes emits noncompliant files doesn't mean you should too.
 */
#define C_MAX_BLOCKS_IN_MCU   10	/* compressor's limit on blocks per MCU */
#ifndef D_MAX_BLOCKS_IN_MCU
#define D_MAX_BLOCKS_IN_MCU   10	/* decompressor's limit on blocks per MCU */
#endif


/* This macro is used to declare a "method", that is, a function pointer.
 * We want to supply prototype parameters if the compiler can cope.
 * Note that the arglist parameter must be parenthesized!
 */

#ifdef HAVE_PROTOTYPES
#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
#else
#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
#endif


/* Data structures for images (arrays of samples and of DCT coefficients).
 * On 80x86 machines, the image arrays are too big for near pointers,
 * but the pointer arrays can fit in near memory.
 */

typedef JSAMPLE FAR *JSAMPROW;	/* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;	/* ptr to some rows (a 2-D sample array) */
typedef JSAMPARRAY *JSAMPIMAGE;	/* a 3-D sample array: top index is color */

typedef JCOEF   JBLOCK[DCTSIZE2];	/* one block of coefficients */
typedef JBLOCK FAR *JBLOCKROW;	/* pointer to one row of coefficient blocks */
typedef JBLOCKROW *JBLOCKARRAY;	/* a 2-D array of coefficient blocks */
typedef JBLOCKARRAY *JBLOCKIMAGE;	/* a 3-D array of coefficient blocks */

typedef JCOEF FAR *JCOEFPTR;	/* useful in a couple of places */


/* Types for JPEG compression parameters and working tables. */


/* DCT coefficient quantization tables. */

typedef struct
{
	/* This field directly represents the contents of a JPEG DQT marker.
	 * Note: the values are always given in zigzag order.
	 */
	UINT16          quantval[DCTSIZE2];	/* quantization step for each coefficient */
	/* This field is used only during compression.  It's initialized FALSE when
	 * the table is created, and set TRUE when it's been output to the file.
	 * You could suppress output of a table by setting this to TRUE.
	 * (See jpeg_suppress_tables for an example.)
	 */
	boolean         sent_table;	/* TRUE when table has been output */
} JQUANT_TBL;


/* Huffman coding tables. */

typedef struct
{
	/* These two fields directly represent the contents of a JPEG DHT marker */
	UINT8           bits[17];	/* bits[k] = # of symbols with codes of */
	/* length k bits; bits[0] is unused */
	UINT8           huffval[256];	/* The symbols, in order of incr code length */
	/* This field is used only during compression.  It's initialized FALSE when
	 * the table is created, and set TRUE when it's been output to the file.
	 * You could suppress output of a table by setting this to TRUE.
	 * (See jpeg_suppress_tables for an example.)
	 */
	boolean         sent_table;	/* TRUE when table has been output */
} JHUFF_TBL;


/* Basic info about one component (color channel). */

typedef struct
{
	/* These values are fixed over the whole image. */
	/* For compression, they must be supplied by parameter setup; */
	/* for decompression, they are read from the SOF marker. */
	int             component_id;	/* identifier for this component (0..255) */
	int             component_index;	/* its index in SOF or cinfo->comp_info[] */
	int             h_samp_factor;	/* horizontal sampling factor (1..4) */
	int             v_samp_factor;	/* vertical sampling factor (1..4) */
	int             quant_tbl_no;	/* quantization table selector (0..3) */
	/* These values may vary between scans. */
	/* For compression, they must be supplied by parameter setup; */
	/* for decompression, they are read from the SOS marker. */
	/* The decompressor output side may not use these variables. */
	int             dc_tbl_no;	/* DC entropy table selector (0..3) */
	int             ac_tbl_no;	/* AC entropy table selector (0..3) */

	/* Remaining fields should be treated as private by applications. */

	/* These values are computed during compression or decompression startup: */
	/* Component's size in DCT blocks.
	 * Any dummy blocks added to complete an MCU are not counted; therefore
	 * these values do not depend on whether a scan is interleaved or not.
	 */
	JDIMENSION      width_in_blocks;
	JDIMENSION      height_in_blocks;
	/* Size of a DCT block in samples.  Always DCTSIZE for compression.
	 * For decompression this is the size of the output from one DCT block,
	 * reflecting any scaling we choose to apply during the IDCT step.
	 * Values of 1,2,4,8 are likely to be supported.  Note that different
	 * components may receive different IDCT scalings.
	 */
	int             DCT_scaled_size;
	/* The downsampled dimensions are the component's actual, unpadded number
	 * of samples at the main buffer (preprocessing/compression interface), thus
	 * downsampled_width = ceil(image_width * Hi/Hmax)
	 * and similarly for height.  For decompression, IDCT scaling is included, so
	 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
	 */
	JDIMENSION      downsampled_width;	/* actual width in samples */
	JDIMENSION      downsampled_height;	/* actual height in samples */
	/* This flag is used only for decompression.  In cases where some of the
	 * components will be ignored (eg grayscale output from YCbCr image),
	 * we can skip most computations for the unused components.
	 */
	boolean         component_needed;	/* do we need the value of this component? */

	/* These values are computed before starting a scan of the component. */
	/* The decompressor output side may not use these variables. */
	int             MCU_width;	/* number of blocks per MCU, horizontally */
	int             MCU_height;	/* number of blocks per MCU, vertically */
	int             MCU_blocks;	/* MCU_width * MCU_height */
	int             MCU_sample_width;	/* MCU width in samples, MCU_width*DCT_scaled_size */
	int             last_col_width;	/* # of non-dummy blocks across in last MCU */
	int             last_row_height;	/* # of non-dummy blocks down in last MCU */

	/* Saved quantization table for component; NULL if none yet saved.
	 * See jdinput.c comments about the need for this information.
	 * This field is not currently used by the compressor.
	 */
	JQUANT_TBL     *quant_table;

	/* Private per-component storage for DCT or IDCT subsystem. */
	void           *dct_table;
} jpeg_component_info;


/* The script for encoding a multiple-scan file is an array of these: */

typedef struct
{
	int             comps_in_scan;	/* number of components encoded in this scan */
	int             component_index[MAX_COMPS_IN_SCAN];	/* their SOF/comp_info[] indexes */
	int             Ss, Se;		/* progressive JPEG spectral selection parms */
	int             Ah, Al;		/* progressive JPEG successive approx. parms */
} jpeg_scan_info;


/* Known color spaces. */

typedef enum
{
	JCS_UNKNOWN,				/* error/unspecified */
	JCS_GRAYSCALE,				/* monochrome */
	JCS_RGB,					/* red/green/blue */
	JCS_YCbCr,					/* Y/Cb/Cr (also known as YUV) */
	JCS_CMYK,					/* C/M/Y/K */
	JCS_YCCK					/* Y/Cb/Cr/K */
} J_COLOR_SPACE;

/* DCT/IDCT algorithm options. */

typedef enum
{
	JDCT_ISLOW,					/* slow but accurate integer algorithm */
	JDCT_IFAST,					/* faster, less accurate integer method */
	JDCT_FLOAT					/* floating-point: accurate, fast on fast HW */
} J_DCT_METHOD;

#ifndef JDCT_DEFAULT			/* may be overridden in jconfig.h */
#define JDCT_DEFAULT  JDCT_ISLOW
#endif
#ifndef JDCT_FASTEST			/* may be overridden in jconfig.h */
#define JDCT_FASTEST  JDCT_IFAST
#endif

/* Dithering options for decompression. */

typedef enum
{
	JDITHER_NONE,				/* no dithering */
	JDITHER_ORDERED,			/* simple ordered dither */
	JDITHER_FS					/* Floyd-Steinberg error diffusion dither */
} J_DITHER_MODE;


/* Common fields between JPEG compression and decompression master structs. */

#define jpeg_common_fields \
  struct jpeg_error_mgr * err;	/* Error handler module */\
  struct jpeg_memory_mgr * mem;	/* Memory manager module */\
  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
  boolean is_decompressor;	/* so common code can tell which is which */\
  int global_state				/* for checking call sequence validity */

/* Routines that are to be used by both halves of the library are declared
 * to receive a pointer to this structure.  There are no actual instances of
 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
 */
struct jpeg_common_struct
{
	jpeg_common_fields;			/* Fields common to both master struct types */
	/* Additional fields follow in an actual jpeg_compress_struct or
	 * jpeg_decompress_struct.  All three structs must agree on these
	 * initial fields!  (This would be a lot cleaner in C++.)
	 */
};

typedef struct jpeg_common_struct *j_common_ptr;
typedef struct jpeg_compress_struct *j_compress_ptr;
typedef struct jpeg_decompress_struct *j_decompress_ptr;


/* Master record for a compression instance */

struct jpeg_compress_struct
{
	jpeg_common_fields;			/* Fields shared with jpeg_decompress_struct */

	/* Destination for compressed data */
	struct jpeg_destination_mgr *dest;

	/* Description of source image --- these fields must be filled in by
	 * outer application before starting compression.  in_color_space must
	 * be correct before you can even call jpeg_set_defaults().
	 */

	JDIMENSION      image_width;	/* input image width */
	JDIMENSION      image_height;	/* input image height */
	int             input_components;	/* # of color components in input image */
	J_COLOR_SPACE   in_color_space;	/* colorspace of input image */

	double          input_gamma;	/* image gamma of input image */

	/* Compression parameters --- these fields must be set before calling
	 * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
	 * initialize everything to reasonable defaults, then changing anything
	 * the application specifically wants to change.  That way you won't get
	 * burnt when new parameters are added.  Also note that there are several
	 * helper routines to simplify changing parameters.
	 */

	int             data_precision;	/* bits of precision in image data */

	int             num_components;	/* # of color components in JPEG image */
	J_COLOR_SPACE   jpeg_color_space;	/* colorspace of JPEG image */

	jpeg_component_info *comp_info;
	/* comp_info[i] describes component that appears i'th in SOF */

	JQUANT_TBL     *quant_tbl_ptrs[NUM_QUANT_TBLS];
	/* ptrs to coefficient quantization tables, or NULL if not defined */

	JHUFF_TBL      *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
	JHUFF_TBL      *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
	/* ptrs to Huffman coding tables, or NULL if not defined */

	UINT8           arith_dc_L[NUM_ARITH_TBLS];	/* L values for DC arith-coding tables */
	UINT8           arith_dc_U[NUM_ARITH_TBLS];	/* U values for DC arith-coding tables */
	UINT8           arith_ac_K[NUM_ARITH_TBLS];	/* Kx values for AC arith-coding tables */

	int             num_scans;	/* # of entries in scan_info array */
	const jpeg_scan_info *scan_info;	/* script for multi-scan file, or NULL */
	/* The default value of scan_info is NULL, which causes a single-scan
	 * sequential JPEG file to be emitted.  To create a multi-scan file,
	 * set num_scans and scan_info to point to an array of scan definitions.
	 */

	boolean         raw_data_in;	/* TRUE=caller supplies downsampled data */
	boolean         arith_code;	/* TRUE=arithmetic coding, FALSE=Huffman */
	boolean         optimize_coding;	/* TRUE=optimize entropy encoding parms */
	boolean         CCIR601_sampling;	/* TRUE=first samples are cosited */
	int             smoothing_factor;	/* 1..100, or 0 for no input smoothing */
	J_DCT_METHOD    dct_method;	/* DCT algorithm selector */

	/* The restart interval can be specified in absolute MCUs by setting
	 * restart_interval, or in MCU rows by setting restart_in_rows
	 * (in which case the correct restart_interval will be figured
	 * for each scan).
	 */
	unsigned int    restart_interval;	/* MCUs per restart, or 0 for no restart */
	int             restart_in_rows;	/* if > 0, MCU rows per restart interval */

	/* Parameters controlling emission of special markers. */

	boolean         write_JFIF_header;	/* should a JFIF marker be written? */
	/* These three values are not used by the JPEG code, merely copied */
	/* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
	/* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
	/* ratio is defined by X_density/Y_density even when density_unit=0. */
	UINT8           density_unit;	/* JFIF code for pixel size units */
	UINT16          X_density;	/* Horizontal pixel density */
	UINT16          Y_density;	/* Vertical pixel density */
	boolean         write_Adobe_marker;	/* should an Adobe marker be written? */

	/* State variable: index of next scanline to be written to
	 * jpeg_write_scanlines().  Application may use this to control its
	 * processing loop, e.g., "while (next_scanline < image_height)".
	 */

	JDIMENSION      next_scanline;	/* 0 .. image_height-1  */

	/* Remaining fields are known throughout compressor, but generally
	 * should not be touched by a surrounding application.
	 */

	/*
	 * These fields are computed during compression startup
	 */
	boolean         progressive_mode;	/* TRUE if scan script uses progressive mode */
	int             max_h_samp_factor;	/* largest h_samp_factor */
	int             max_v_samp_factor;	/* largest v_samp_factor */

	JDIMENSION      total_iMCU_rows;	/* # of iMCU rows to be input to coef ctlr */
	/* The coefficient controller receives data in units of MCU rows as defined
	 * for fully interleaved scans (whether the JPEG file is interleaved or not).
	 * There are v_samp_factor * DCTSIZE sample rows of each component in an
	 * "iMCU" (interleaved MCU) row.
	 */

	/*
	 * These fields are valid during any one scan.
	 * They describe the components and MCUs actually appearing in the scan.
	 */
	int             comps_in_scan;	/* # of JPEG components in this scan */
	jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
	/* *cur_comp_info[i] describes component that appears i'th in SOS */

	JDIMENSION      MCUs_per_row;	/* # of MCUs across the image */
	JDIMENSION      MCU_rows_in_scan;	/* # of MCU rows in the image */

	int             blocks_in_MCU;	/* # of DCT blocks per MCU */
	int             MCU_membership[C_MAX_BLOCKS_IN_MCU];
	/* MCU_membership[i] is index in cur_comp_info of component owning */
	/* i'th block in an MCU */

	int             Ss, Se, Ah, Al;	/* progressive JPEG parameters for scan */

	/*
	 * Links to compression subobjects (methods and private variables of modules)
	 */
	struct jpeg_comp_master *master;
	struct jpeg_c_main_controller *main;
	struct jpeg_c_prep_controller *prep;
	struct jpeg_c_coef_controller *coef;
	struct jpeg_marker_writer *marker;
	struct jpeg_color_converter *cconvert;
	struct jpeg_downsampler *downsample;
	struct jpeg_forward_dct *fdct;
	struct jpeg_entropy_encoder *entropy;
};


/* Master record for a decompression instance */

struct jpeg_decompress_struct
{
	jpeg_common_fields;			/* Fields shared with jpeg_compress_struct */

	/* Source of compressed data */
	struct jpeg_source_mgr *src;

	/* Basic description of image --- filled in by jpeg_read_header(). */
	/* Application may inspect these values to decide how to process image. */

	JDIMENSION      image_width;	/* nominal image width (from SOF marker) */
	JDIMENSION      image_height;	/* nominal image height */
	int             num_components;	/* # of color components in JPEG image */
	J_COLOR_SPACE   jpeg_color_space;	/* colorspace of JPEG image */

	/* Decompression processing parameters --- these fields must be set before
	 * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
	 * them to default values.
	 */

	J_COLOR_SPACE   out_color_space;	/* colorspace for output */

	unsigned int    scale_num, scale_denom;	/* fraction by which to scale image */

	double          output_gamma;	/* image gamma wanted in output */

	boolean         buffered_image;	/* TRUE=multiple output passes */
	boolean         raw_data_out;	/* TRUE=downsampled data wanted */

	J_DCT_METHOD    dct_method;	/* IDCT algorithm selector */
	boolean         do_fancy_upsampling;	/* TRUE=apply fancy upsampling */
	boolean         do_block_smoothing;	/* TRUE=apply interblock smoothing */

	boolean         quantize_colors;	/* TRUE=colormapped output wanted */
	/* the following are ignored if not quantize_colors: */
	J_DITHER_MODE   dither_mode;	/* type of color dithering to use */
	boolean         two_pass_quantize;	/* TRUE=use two-pass color quantization */
	int             desired_number_of_colors;	/* max # colors to use in created colormap */
	/* these are significant only in buffered-image mode: */
	boolean         enable_1pass_quant;	/* enable future use of 1-pass quantizer */
	boolean         enable_external_quant;	/* enable future use of external colormap */
	boolean         enable_2pass_quant;	/* enable future use of 2-pass quantizer */

	/* Description of actual output image that will be returned to application.
	 * These fields are computed by jpeg_start_decompress().
	 * You can also use jpeg_calc_output_dimensions() to determine these values
	 * in advance of calling jpeg_start_decompress().
	 */

	JDIMENSION      output_width;	/* scaled image width */
	JDIMENSION      output_height;	/* scaled image height */
	int             out_color_components;	/* # of color components in out_color_space */
	int             output_components;	/* # of color components returned */
	/* output_components is 1 (a colormap index) when quantizing colors;
	 * otherwise it equals out_color_components.
	 */
	int             rec_outbuf_height;	/* min recommended height of scanline buffer */
	/* If the buffer passed to jpeg_read_scanlines() is less than this many rows
	 * high, space and time will be wasted due to unnecessary data copying.
	 * Usually rec_outbuf_height will be 1 or 2, at most 4.
	 */

	/* When quantizing colors, the output colormap is described by these fields.
	 * The application can supply a colormap by setting colormap non-NULL before
	 * calling jpeg_start_decompress; otherwise a colormap is created during
	 * jpeg_start_decompress or jpeg_start_output.
	 * The map has out_color_components rows and actual_number_of_colors columns.
	 */
	int             actual_number_of_colors;	/* number of entries in use */
	JSAMPARRAY      colormap;	/* The color map as a 2-D pixel array */

	/* State variables: these variables indicate the progress of decompression.
	 * The application may examine these but must not modify them.
	 */

	/* Row index of next scanline to be read from jpeg_read_scanlines().
	 * Application may use this to control its processing loop, e.g.,
	 * "while (output_scanline < output_height)".
	 */
	JDIMENSION      output_scanline;	/* 0 .. output_height-1  */

	/* Current input scan number and number of iMCU rows completed in scan.
	 * These indicate the progress of the decompressor input side.
	 */
	int             input_scan_number;	/* Number of SOS markers seen so far */
	JDIMENSION      input_iMCU_row;	/* Number of iMCU rows completed */

	/* The "output scan number" is the notional scan being displayed by the
	 * output side.  The decompressor will not allow output scan/row number
	 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
	 */
	int             output_scan_number;	/* Nominal scan number being displayed */
	JDIMENSION      output_iMCU_row;	/* Number of iMCU rows read */

	/* Current progression status.  coef_bits[c][i] indicates the precision
	 * with which component c's DCT coefficient i (in zigzag order) is known.
	 * It is -1 when no data has yet been received, otherwise it is the point
	 * transform (shift) value for the most recent scan of the coefficient
	 * (thus, 0 at completion of the progression).
	 * This pointer is NULL when reading a non-progressive file.
	 */
	int             (*coef_bits)[DCTSIZE2];	/* -1 or current Al value for each coef */

	/* Internal JPEG parameters --- the application usually need not look at
	 * these fields.  Note that the decompressor output side may not use
	 * any parameters that can change between scans.
	 */

	/* Quantization and Huffman tables are carried forward across input
	 * datastreams when processing abbreviated JPEG datastreams.
	 */

	JQUANT_TBL     *quant_tbl_ptrs[NUM_QUANT_TBLS];
	/* ptrs to coefficient quantization tables, or NULL if not defined */

	JHUFF_TBL      *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
	JHUFF_TBL      *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
	/* ptrs to Huffman coding tables, or NULL if not defined */

	/* These parameters are never carried across datastreams, since they
	 * are given in SOF/SOS markers or defined to be reset by SOI.
	 */

	int             data_precision;	/* bits of precision in image data */

	jpeg_component_info *comp_info;
	/* comp_info[i] describes component that appears i'th in SOF */

	boolean         progressive_mode;	/* TRUE if SOFn specifies progressive mode */
	boolean         arith_code;	/* TRUE=arithmetic coding, FALSE=Huffman */

	UINT8           arith_dc_L[NUM_ARITH_TBLS];	/* L values for DC arith-coding tables */
	UINT8           arith_dc_U[NUM_ARITH_TBLS];	/* U values for DC arith-coding tables */
	UINT8           arith_ac_K[NUM_ARITH_TBLS];	/* Kx values for AC arith-coding tables */

	unsigned int    restart_interval;	/* MCUs per restart interval, or 0 for no restart */

	/* These fields record data obtained from optional markers recognized by
	 * the JPEG library.
	 */
	boolean         saw_JFIF_marker;	/* TRUE iff a JFIF APP0 marker was found */
	/* Data copied from JFIF marker: */
	UINT8           density_unit;	/* JFIF code for pixel size units */
	UINT16          X_density;	/* Horizontal pixel density */
	UINT16          Y_density;	/* Vertical pixel density */
	boolean         saw_Adobe_marker;	/* TRUE iff an Adobe APP14 marker was found */
	UINT8           Adobe_transform;	/* Color transform code from Adobe marker */

	boolean         CCIR601_sampling;	/* TRUE=first samples are cosited */

	/* Remaining fields are known throughout decompressor, but generally
	 * should not be touched by a surrounding application.
	 */

	/*
	 * These fields are computed during decompression startup
	 */
	int             max_h_samp_factor;	/* largest h_samp_factor */
	int             max_v_samp_factor;	/* largest v_samp_factor */

	int             min_DCT_scaled_size;	/* smallest DCT_scaled_size of any component */

	JDIMENSION      total_iMCU_rows;	/* # of iMCU rows in image */
	/* The coefficient controller's input and output progress is measured in
	 * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
	 * in fully interleaved JPEG scans, but are used whether the scan is
	 * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
	 * rows of each component.  Therefore, the IDCT output contains
	 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
	 */

	JSAMPLE        *sample_range_limit;	/* table for fast range-limiting */

	/*
	 * These fields are valid during any one scan.
	 * They describe the components and MCUs actually appearing in the scan.
	 * Note that the decompressor output side must not use these fields.
	 */
	int             comps_in_scan;	/* # of JPEG components in this scan */
	jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
	/* *cur_comp_info[i] describes component that appears i'th in SOS */

	JDIMENSION      MCUs_per_row;	/* # of MCUs across the image */
	JDIMENSION      MCU_rows_in_scan;	/* # of MCU rows in the image */

	int             blocks_in_MCU;	/* # of DCT blocks per MCU */
	int             MCU_membership[D_MAX_BLOCKS_IN_MCU];
	/* MCU_membership[i] is index in cur_comp_info of component owning */
	/* i'th block in an MCU */

	int             Ss, Se, Ah, Al;	/* progressive JPEG parameters for scan */

	/* This field is shared between entropy decoder and marker parser.
	 * It is either zero or the code of a JPEG marker that has been
	 * read from the data source, but has not yet been processed.
	 */
	int             unread_marker;

	/*
	 * Links to decompression subobjects (methods, private variables of modules)
	 */
	struct jpeg_decomp_master *master;
	struct jpeg_d_main_controller *main;
	struct jpeg_d_coef_controller *coef;
	struct jpeg_d_post_controller *post;
	struct jpeg_input_controller *inputctl;
	struct jpeg_marker_reader *marker;
	struct jpeg_entropy_decoder *entropy;
	struct jpeg_inverse_dct *idct;
	struct jpeg_upsampler *upsample;
	struct jpeg_color_deconverter *cconvert;
	struct jpeg_color_quantizer *cquantize;
};


/* "Object" declarations for JPEG modules that may be supplied or called
 * directly by the surrounding application.
 * As with all objects in the JPEG library, these structs only define the
 * publicly visible methods and state variables of a module.  Additional
 * private fields may exist after the public ones.
 */


/* Error handler object */

struct jpeg_error_mgr
{
	/* Error exit handler: does not return to caller */
	JMETHOD(void, error_exit, (j_common_ptr cinfo));
	/* Conditionally emit a trace or warning message */
	                JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
	/* Routine that actually outputs a trace or error message */
	                JMETHOD(void, output_message, (j_common_ptr cinfo));
	/* Format a message string for the most recent JPEG error or message */
	                JMETHOD(void, format_message, (j_common_ptr cinfo, char *buffer));
#define JMSG_LENGTH_MAX  200	/* recommended size of format_message buffer */
	/* Reset error state variables at start of a new image */
	                JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));

	/* The message ID code and any parameters are saved here.
	 * A message can have one string parameter or up to 8 int parameters.
	 */
	int             msg_code;
#define JMSG_STR_PARM_MAX  80
	union
	{
		int             i[8];
		char            s[JMSG_STR_PARM_MAX];
	} msg_parm;

	/* Standard state variables for error facility */

	int             trace_level;	/* max msg_level that will be displayed */

	/* For recoverable corrupt-data errors, we emit a warning message,
	 * but keep going unless emit_message chooses to abort.  emit_message
	 * should count warnings in num_warnings.  The surrounding application
	 * can check for bad data by seeing if num_warnings is nonzero at the
	 * end of processing.
	 */
	long            num_warnings;	/* number of corrupt-data warnings */

	/* These fields point to the table(s) of error message strings.
	 * An application can change the table pointer to switch to a different
	 * message list (typically, to change the language in which errors are
	 * reported).  Some applications may wish to add additional error codes
	 * that will be handled by the JPEG library error mechanism; the second
	 * table pointer is used for this purpose.
	 *
	 * First table includes all errors generated by JPEG library itself.
	 * Error code 0 is reserved for a "no such error string" message.
	 */
	const char     *const *jpeg_message_table;	/* Library errors */
	int             last_jpeg_message;	/* Table contains strings 0..last_jpeg_message */
	/* Second table can be added by application (see cjpeg/djpeg for example).
	 * It contains strings numbered first_addon_message..last_addon_message.
	 */
	const char     *const *addon_message_table;	/* Non-library errors */
	int             first_addon_message;	/* code for first string in addon table */
	int             last_addon_message;	/* code for last string in addon table */
};


/* Progress monitor object */

struct jpeg_progress_mgr
{
	JMETHOD(void, progress_monitor, (j_common_ptr cinfo));

	long            pass_counter;	/* work units completed in this pass */
	long            pass_limit;	/* total number of work units in this pass */
	int             completed_passes;	/* passes completed so far */
	int             total_passes;	/* total number of passes expected */
};


/* Data destination object for compression */

struct jpeg_destination_mgr
{
	JOCTET         *next_output_byte;	/* => next byte to write in buffer */
	size_t          free_in_buffer;	/* # of byte spaces remaining in buffer */

	                JMETHOD(void, init_destination, (j_compress_ptr cinfo));
	                JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
	                JMETHOD(void, term_destination, (j_compress_ptr cinfo));
};


/* Data source object for decompression */

struct jpeg_source_mgr
{
	const JOCTET   *next_input_byte;	/* => next byte to read from buffer */
	size_t          bytes_in_buffer;	/* # of bytes remaining in buffer */

	                JMETHOD(void, init_source, (j_decompress_ptr cinfo));
	                JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
	                JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
	                JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
	                JMETHOD(void, term_source, (j_decompress_ptr cinfo));
};


/* Memory manager object.
 * Allocates "small" objects (a few K total), "large" objects (tens of K),
 * and "really big" objects (virtual arrays with backing store if needed).
 * The memory manager does not allow individual objects to be freed; rather,
 * each created object is assigned to a pool, and whole pools can be freed
 * at once.  This is faster and more convenient than remembering exactly what
 * to free, especially where malloc()/free() are not too speedy.
 * NB: alloc routines never return NULL.  They exit to error_exit if not
 * successful.
 */

#define JPOOL_PERMANENT	0		/* lasts until master record is destroyed */
#define JPOOL_IMAGE	1			/* lasts until done with image/datastream */
#define JPOOL_NUMPOOLS	2

typedef struct jvirt_sarray_control *jvirt_sarray_ptr;
typedef struct jvirt_barray_control *jvirt_barray_ptr;


struct jpeg_memory_mgr
{
	/* Method pointers */
	JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, size_t sizeofobject));
	                JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, size_t sizeofobject));
	     
		 
		 
		      JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow, JDIMENSION numrows));
	     
		 
		 
		      JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow, JDIMENSION numrows));
	     
		 
		 
		 
		 
		 
		JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
														int pool_id,
														boolean pre_zero,
														JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess));
	     
		 
		 
		 
		 
		 
		JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
														int pool_id,
														boolean pre_zero,
														JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess));
	                JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
	     
		 
		 
		 
		 
		 
		JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
												 jvirt_sarray_ptr ptr,
												 JDIMENSION start_row, JDIMENSION num_rows, boolean writable));
	     
		 
		 
		 
		 
		 
		JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
												  jvirt_barray_ptr ptr,
												  JDIMENSION start_row, JDIMENSION num_rows, boolean writable));
	                JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
	                JMETHOD(void, self_destruct, (j_common_ptr cinfo));

	/* Limit on memory allocation for this JPEG object.  (Note that this is
	 * merely advisory, not a guaranteed maximum; it only affects the space
	 * used for virtual-array buffers.)  May be changed by outer application
	 * after creating the JPEG object.
	 */
	long            max_memory_to_use;
};


/* Routine signature for application-supplied marker processing methods.
 * Need not pass marker code since it is stored in cinfo->unread_marker.
 */
typedef         JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));


/* Declarations for routines called by application.
 * The JPP macro hides prototype parameters from compilers that can't cope.
 * Note JPP requires double parentheses.
 */

#ifdef HAVE_PROTOTYPES
#define JPP(arglist)	arglist
#else
#define JPP(arglist)	()
#endif


/* Short forms of external names for systems with brain-damaged linkers.
 * We shorten external names to be unique in the first six letters, which
 * is good enough for all known systems.
 * (If your compiler itself needs names to be unique in less than 15 
 * characters, you are out of luck.  Get a better compiler.)
 */

#ifdef NEED_SHORT_EXTERNAL_NAMES
#define jpeg_std_error		jStdError
#define jpeg_create_compress	jCreaCompress
#define jpeg_create_decompress	jCreaDecompress
#define jpeg_destroy_compress	jDestCompress
#define jpeg_destroy_decompress	jDestDecompress
#define jpeg_stdio_dest		jStdDest
#define jpeg_stdio_src		jStdSrc
#define jpeg_set_defaults	jSetDefaults
#define jpeg_set_colorspace	jSetColorspace
#define jpeg_default_colorspace	jDefColorspace
#define jpeg_set_quality	jSetQuality
#define jpeg_set_linear_quality	jSetLQuality
#define jpeg_add_quant_table	jAddQuantTable
#define jpeg_quality_scaling	jQualityScaling
#define jpeg_simple_progression	jSimProgress
#define jpeg_suppress_tables	jSuppressTables
#define jpeg_alloc_quant_table	jAlcQTable
#define jpeg_alloc_huff_table	jAlcHTable
#define jpeg_start_compress	jStrtCompress
#define jpeg_write_scanlines	jWrtScanlines
#define jpeg_finish_compress	jFinCompress
#define jpeg_write_raw_data	jWrtRawData
#define jpeg_write_marker	jWrtMarker
#define jpeg_write_tables	jWrtTables
#define jpeg_read_header	jReadHeader
#define jpeg_start_decompress	jStrtDecompress
#define jpeg_read_scanlines	jReadScanlines
#define jpeg_finish_decompress	jFinDecompress
#define jpeg_read_raw_data	jReadRawData
#define jpeg_has_multiple_scans	jHasMultScn
#define jpeg_start_output	jStrtOutput
#define jpeg_finish_output	jFinOutput
#define jpeg_input_complete	jInComplete
#define jpeg_new_colormap	jNewCMap
#define jpeg_consume_input	jConsumeInput
#define jpeg_calc_output_dimensions	jCalcDimensions
#define jpeg_set_marker_processor	jSetMarker
#define jpeg_read_coefficients	jReadCoefs
#define jpeg_write_coefficients	jWrtCoefs
#define jpeg_copy_critical_parameters	jCopyCrit
#define jpeg_abort_compress	jAbrtCompress
#define jpeg_abort_decompress	jAbrtDecompress
#define jpeg_abort		jAbort
#define jpeg_destroy		jDestroy
#define jpeg_resync_to_restart	jResyncRestart
#endif							/* NEED_SHORT_EXTERNAL_NAMES */


/* Default error-management setup */
EXTERN struct jpeg_error_mgr *jpeg_std_error JPP((struct jpeg_error_mgr * err));

/* Initialization and destruction of JPEG compression objects */
/* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx */
EXTERN void jpeg_create_compress JPP((j_compress_ptr cinfo));
EXTERN void jpeg_create_decompress JPP((j_decompress_ptr cinfo));
EXTERN void jpeg_destroy_compress JPP((j_compress_ptr cinfo));
EXTERN void jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));

/* Standard data source and destination managers: stdio streams. */
/* Caller is responsible for opening the file before and closing after. */
EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
EXTERN void jpeg_stdio_src JPP((j_decompress_ptr cinfo, unsigned char *infile));

/* Default parameter setup for compression */
EXTERN void jpeg_set_defaults JPP((j_compress_ptr cinfo));

/* Compression parameter setup aids */
EXTERN void jpeg_set_colorspace JPP((j_compress_ptr cinfo, J_COLOR_SPACE colorspace));
EXTERN void jpeg_default_colorspace JPP((j_compress_ptr cinfo));
EXTERN void jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, boolean force_baseline));
EXTERN void jpeg_set_linear_quality JPP((j_compress_ptr cinfo, int scale_factor, boolean force_baseline));
EXTERN void jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
									  const unsigned int *basic_table, int scale_factor, boolean force_baseline));
EXTERN int jpeg_quality_scaling JPP((int quality));
EXTERN void jpeg_simple_progression JPP((j_compress_ptr cinfo));
EXTERN void jpeg_suppress_tables JPP((j_compress_ptr cinfo, boolean suppress));
EXTERN JQUANT_TBL *jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
EXTERN JHUFF_TBL *jpeg_alloc_huff_table JPP((j_common_ptr cinfo));

/* Main entry points for compression */
EXTERN void jpeg_start_compress JPP((j_compress_ptr cinfo, boolean write_all_tables));
EXTERN JDIMENSION jpeg_write_scanlines JPP((j_compress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION num_lines));
EXTERN void jpeg_finish_compress JPP((j_compress_ptr cinfo));

/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
EXTERN JDIMENSION jpeg_write_raw_data JPP((j_compress_ptr cinfo, JSAMPIMAGE data, JDIMENSION num_lines));

/* Write a special marker.  See libjpeg.doc concerning safe usage. */
EXTERN void jpeg_write_marker JPP((j_compress_ptr cinfo, int marker, const JOCTET * dataptr, unsigned int datalen));

/* Alternate compression function: just write an abbreviated table file */
EXTERN void jpeg_write_tables JPP((j_compress_ptr cinfo));

/* Decompression startup: read start of JPEG datastream to see what's there */
EXTERN int jpeg_read_header JPP((j_decompress_ptr cinfo, boolean require_image));

/* Return value is one of: */
#define JPEG_SUSPENDED		0	/* Suspended due to lack of input data */
#define JPEG_HEADER_OK		1	/* Found valid image datastream */
#define JPEG_HEADER_TABLES_ONLY	2	/* Found valid table-specs-only datastream */
/* If you pass require_image = TRUE (normal case), you need not check for
 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
 * JPEG_SUSPENDED is only possible if you use a data source module that can
 * give a suspension return (the stdio source module doesn't).
 */

/* Main entry points for decompression */
EXTERN boolean jpeg_start_decompress JPP((j_decompress_ptr cinfo));
EXTERN JDIMENSION jpeg_read_scanlines JPP((j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines));
EXTERN boolean jpeg_finish_decompress JPP((j_decompress_ptr cinfo));

/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
EXTERN JDIMENSION jpeg_read_raw_data JPP((j_decompress_ptr cinfo, JSAMPIMAGE data, JDIMENSION max_lines));

/* Additional entry points for buffered-image mode. */
EXTERN boolean jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
EXTERN boolean jpeg_start_output JPP((j_decompress_ptr cinfo, int scan_number));
EXTERN boolean jpeg_finish_output JPP((j_decompress_ptr cinfo));
EXTERN boolean jpeg_input_complete JPP((j_decompress_ptr cinfo));
EXTERN void jpeg_new_colormap JPP((j_decompress_ptr cinfo));
EXTERN int jpeg_consume_input JPP((j_decompress_ptr cinfo));

/* Return value is one of: */
/* #define JPEG_SUSPENDED	0    Suspended due to lack of input data */
#define JPEG_REACHED_SOS	1	/* Reached start of new scan */
#define JPEG_REACHED_EOI	2	/* Reached end of image */
#define JPEG_ROW_COMPLETED	3	/* Completed one iMCU row */
#define JPEG_SCAN_COMPLETED	4	/* Completed last iMCU row of a scan */

/* Precalculate output dimensions for current decompression parameters. */
EXTERN void jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));

/* Install a special processing method for COM or APPn markers. */
EXTERN void jpeg_set_marker_processor JPP((j_decompress_ptr cinfo, int marker_code, jpeg_marker_parser_method routine));

/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
EXTERN jvirt_barray_ptr *jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
EXTERN void jpeg_write_coefficients JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
EXTERN void jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo));

/* If you choose to abort compression or decompression before completing
 * jpeg_finish_(de)compress, then you need to clean up to release memory,
 * temporary files, etc.  You can just call jpeg_destroy_(de)compress
 * if you're done with the JPEG object, but if you want to clean it up and
 * reuse it, call this:
 */
EXTERN void jpeg_abort_compress JPP((j_compress_ptr cinfo));
EXTERN void jpeg_abort_decompress JPP((j_decompress_ptr cinfo));

/* Generic versions of jpeg_abort and jpeg_destroy that work on either
 * flavor of JPEG object.  These may be more convenient in some places.
 */
EXTERN void jpeg_abort JPP((j_common_ptr cinfo));
EXTERN void jpeg_destroy JPP((j_common_ptr cinfo));

/* Default restart-marker-resync procedure for use by data source modules */
EXTERN boolean jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, int desired));


/* These marker codes are exported since applications and data source modules
 * are likely to want to use them.
 */

#define JPEG_RST0	0xD0		/* RST0 marker code */
#define JPEG_EOI	0xD9		/* EOI marker code */
#define JPEG_APP0	0xE0		/* APP0 marker code */
#define JPEG_COM	0xFE		/* COM marker code */


/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
 * for structure definitions that are never filled in, keep it quiet by
 * supplying dummy definitions for the various substructures.
 */

#ifdef INCOMPLETE_TYPES_BROKEN
#ifndef JPEG_INTERNALS			/* will be defined in jpegint.h */
struct jvirt_sarray_control
{
	long            dummy;
};
struct jvirt_barray_control
{
	long            dummy;
};
struct jpeg_comp_master
{
	long            dummy;
};
struct jpeg_c_main_controller
{
	long            dummy;
};
struct jpeg_c_prep_controller
{
	long            dummy;
};
struct jpeg_c_coef_controller
{
	long            dummy;
};
struct jpeg_marker_writer
{
	long            dummy;
};
struct jpeg_color_converter
{
	long            dummy;
};
struct jpeg_downsampler
{
	long            dummy;
};
struct jpeg_forward_dct
{
	long            dummy;
};
struct jpeg_entropy_encoder
{
	long            dummy;
};
struct jpeg_decomp_master
{
	long            dummy;
};
struct jpeg_d_main_controller
{
	long            dummy;
};
struct jpeg_d_coef_controller
{
	long            dummy;
};
struct jpeg_d_post_controller
{
	long            dummy;
};
struct jpeg_input_controller
{
	long            dummy;
};
struct jpeg_marker_reader
{
	long            dummy;
};
struct jpeg_entropy_decoder
{
	long            dummy;
};
struct jpeg_inverse_dct
{
	long            dummy;
};
struct jpeg_upsampler
{
	long            dummy;
};
struct jpeg_color_deconverter
{
	long            dummy;
};
struct jpeg_color_quantizer
{
	long            dummy;
};
#endif							/* JPEG_INTERNALS */
#endif							/* INCOMPLETE_TYPES_BROKEN */


/*
 * The JPEG library modules define JPEG_INTERNALS before including this file.
 * The internal structure declarations are read only when that is true.
 * Applications using the library should not include jpegint.h, but may wish
 * to include jerror.h.
 */

#ifdef JPEG_INTERNALS
#include "../jpeg-6/jpegint.h"	/* fetch private declarations */
#include "../jpeg-6/jerror.h"	/* fetch error codes too */
#endif

#endif							/* JPEGLIB_H */
